/**
 * Created by john on 2016/3/19.
 */
(function (doc, win) {
    var docEl = doc.documentElement,
        resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
        recalc = function () {
            var clientWidth = docEl.clientWidth;
            if (!clientWidth) return;
            docEl.style.fontSize = 20 * (clientWidth / 320) + 'px';
        };
    if (!doc.addEventListener) return;
    win.addEventListener(resizeEvt, recalc, false);
    doc.addEventListener('DOMContentLoaded', recalc, false);
})(document, window);

//ajax
function ajax(url, dat, fn) {
    this.url = url;
    this.data = dat;
    $.ajax({
        url: this.url,
        type: "post",
        data: this.data,
        dataType: "json",
        success: function (data) {
            if (typeof(fn) == 'function') {
                fn(data)
            }
        }
    })
}
